Add KCP implementations

[brandonlamb]

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[0xFA11]

Hey @brandonlamb ,

Thank you for your contribution! :)

I will be merging and updating the list soon when I get a chance.
(I'm slightly busy these days)

[0xFA11]

Hey @brandonlamb,

Sorry, I was quite busy for quite a while and I just found some free time to come back to this.

I think we should simply add original KCP repository to the list instead of different language implementations.
Original repo also contains giant list of language specific implementations as well.

Do you mind if I do not merge this and add KCP into the list separately?

Thanks for your time and contribution again!

[0xFA11]

I just added main KCP repository to the list with commit d26e0dc

Other implementations could be found on the list at the main repository.